Current Sensor Amplification Factor Verification
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Solution Overview
Problem
Conventional current sensor devices cannot determine whether the lack of Hall signal output is due to Hall element failure or an incorrect amplification factor, making it difficult to assess sensitivity abnormalities.
Innovation Solution
A detecting device with a detecting part, amplifying part, reference voltage supply part, switching part, and comparing part that differentially amplifies reference voltages to determine if the amplification factor is correct, allowing for the detection of sensitivity abnormalities by comparing actual and predetermined amplification factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conventional current sensor device only checks Hall signal output without amplification factor verification, then the device complexity is reduced, but the measurement precision and reliability deteriorate because it cannot distinguish between Hall element failure and incorrect amplification factor
Solution Approach 1:
The patent applies preliminary action by performing amplification factor verification using reference voltages before actual current measurement. The verification process checks whether the amplification factor of the amplifier is within a predetermined range by comparing the difference between first and second reference voltages with an expected value, ensuring measurement accuracy is validated in advance.
Solution Approach 2:
The patent uses reference voltages as an intermediary to verify the amplification factor without requiring direct measurement of the amplifier's gain. By introducing first and second reference voltages with a known difference and measuring the amplified output, the system indirectly verifies the amplification factor through a comparison operation, solving the problem of direct amplification factor measurement.
2Ease of operation
If the conventional current sensor device lacks amplification factor verification, then the ease of operation is improved, but the reliability deteriorates because sensitivity abnormalities cannot be detected
Solution Approach 1:
The patent implements self-service by enabling the current sensor device to automatically verify its own amplification factor using internal reference voltages and comparison circuits. The device performs self-diagnosis by checking whether the amplified difference between reference voltages falls within the expected range, allowing it to detect sensitivity abnormalities and potential failures without external intervention.
Solution Approach 2:
The patent applies feedback by using the comparison result of the amplified reference voltage difference to determine whether the amplification factor is within the predetermined range. This feedback mechanism allows the system to detect abnormalities in the amplifier or Hall element and can trigger appropriate responses such as error signaling or measurement cancellation, thereby improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise determination of amplification factor correctness and sensitivity abnormalities, reducing the impact of electromagnetic noise and improving the accuracy of detecting device functionality.
Implementation Method 1
a Hall element configured to be arranged in the voids of the magnetic core and output an electrical signal according to the magnetic flux
Implementation Method 2
an amplifying part configured to amplify the detection signal output from the detecting part so as to output a first amplification signal
Implementation Method 3
a reference voltage supply part configured to supply a reference voltage to the amplifying part, the reference voltage being input to the amplifying part so as to be output as a second amplification signal
Implementation Method 4
a comparing part configured to compare a predetermined amplification factor in the amplifying part, with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal
Data Source
AI summary
A detecting device includes a detecting part configured to detect a change in an object to be detected so as to output a detection signal, an amplifying part configured to amplify the detection signal output from the detecting part to output a first amplification signal, a reference voltage supply part configured to supply a reference voltage to the amplifying part, the reference voltage being input to the amplifying part to be output as a second amplification signal, a switching part configured to switch a connection between the detecting part and the amplifying part or a connection between the amplifying part and the reference voltage supply part based on a control signal input thereto, and a comparing part configured to compare a predetermined amplification factor in the amplifying part, with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal.